... GPI Data Pipeline 1.0 documentation . ... Thermal/Sky Backgrounds . ... Using Thermal/Sky Backgrounds in GPI Data Reduction: . Creating Calibrations: . ... Thermal emission (from sky or telescope) becomes an important background source for wavelengths longer than 2 microns. ... The pipeline treats thermal/sky backgrounds similar to dark frames and is designed to subtract a thermal/sky background, scaled to the integration time of the science image, from K-band observations. ...

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. The anisotropies of the cosmic microwave background (CMB) as observed by Planck. The CMB is a snapshot of the oldest light in our universe, imprinted on the sky when the universe was just 380,000 years old. It shows tiny temperature fluctuations that correspond to regions of slightly different densities, representing the seeds of all future structure the stars and galaxies of today. ESA and the Planck Collaboration - D. Ducros

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... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2013 March 25 . Planck Maps the Microwave Background . ... Visible in all directions, this cosmic microwave background is a complex tapestry that could only show the hot and cold patterns observed were the universe to be composed of specific types of energy that evolved in specific ways. ... About APOD | ... A service of: ASD at NASA / GSFC . ...

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... radiative transfer studies in the dawn . ... Background: The interstellar medium of spiral galaxies is filled by gas and small solid particles, dust grains. ... dust emission at longer wavelengths, as FIR or the submm (bottom picture) allows a direct detection of the grains. ... An ESF workshop on dust in spiral galaxies : European astronomers have always been at the forefront of FIR astronomy, the study of interstellar dust and the development of radiative transfer codes. ...

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... arfgen (arfgen-1.66.4) [xmmsas_20050815_1803-6.5.0] . ... Generates an OGIP-compliant ([ 4 ]) ancillary response file (ARF). The ARF contains a table listing area values (the column SPECRESP ) for a number of different energy ranges (the columns ENERG_LO and ENERG_HI ). The ARF can be used in conjunction with the response matrix file (RMF, generated by rmfgen ) to allow fitting of particular spectral models against the observed spectral data. ... Implemented . ... Bad pixel correction . ...

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• Generation from In-Orbit Data
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... The first step to improve the FORS calibration is therefore to obtain data to allow a computation of the illumination correction across the field. ... Another limitation on the calibration accuracy has been the brightness of the Landolt standards which have forced the use of extremely short exposures introducing small but non-negligible shutter-time errors and also resulting in a very small number of useful standards per frame. ...

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... 12c. Venus transit (1) . 12d. Venus transit (2) . 12e. Venus transit (3) . ... 1 The 2004 Venus transit . ... Kepler's third law allows one to evaluate the dimensions of the solar system in relative units, e.g. in " astronomical units " (AUs), where 1 AU is the mean Sun-Earth distance. ... Edmond Halley suggested using the transit of Venus across the Sun's disk, when it appears as a dark round spot --or to quote one observer of the 2004 transit, "like a blueberry in front of an orange." ...

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... Contacts . 2012: . ... We refined the fundamental parameters of the components, the orbital periods, and the conditions of photospheric heating of the secondary component by the ultraviolet radiation of the hot component. ... The observations of the star clusters associated with ultra-luminous x-ray sources (ULXs) in four galaxies on the 6-meter and VLT telescopes have shown that all the ULXs are located within 200pc of very young star clusters (younger than 5 million years). ... Archive . ...

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... News | ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Facilities . ... Australia Telescope Compact Array . ... Australia Telescope Online Archive (ATOA) . ... ASKAP Home . ... CSIRO has been working with representatives of the NRC ( National Research Council , Canada) and ASTRON (Netherlands Institute for Radio Astronomy) to undertake a collaborative measurement program using three different receiver element designs as part of SKA pre-construction work. ...

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Next: Extragalactic Gravitational Wave Background Previous: Transparency of the Stochastic . Let the sky be observed with a detector having a pencil beam diagram across. The number of stars per frequency decade that is swept by the detector is a function of celestial coordinates (say, galactic coordinates l , b ): . ... It is clear from the figure that for an all-sky detector the Galaxy becomes transparent above the frequency  Hz. ...

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CIMA configuration files offer You a conveniant way of saving CIMA set-ups to files. ... Then instead of making this selections interactively when You are observing, You can just load and apply the configuration files. ... Any other set-up will be ignored! ... In that case, You are forced to use the 'Load only' option to load the configuration file, inspect the selected set-up carefully, apply the set-up (with the 'Accept' or 'Apply' buttons) and then save a new version of the configuration file. ...

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... In collaborative work with David Garc?a Alvarez (an Observatory PhD student now at Harvard) and John Butler, an extensive study of the RS CVn binary HR1099 was completed leading to two papers; the first on Doppler imaging and the second on flare activity. Spectra for the Doppler imaging were taken at two different sites, Kitt Peak National Observatory (KPNO), Arizona, and Mount Stromlo Observatory (MSO), Australia, during the 1998 MUltiSIte COntinuous Spectroscopic (MUSICOS) campaign. ...

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RTT150 . ... This search system is designed for generating the necessary information on series of pointings (observations of each source consist of sets of exposures with different filters and sometimes with different exposure times) for observed sources. Search results appear at the separate page as a table with the following data: . DATE - real (not evening!) observations date (in YYYY-MM-DD format); . ... Bin - minimal CCD binning mode (may vary during the observations); . ...

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... Galaxies 99 Cosmic background with model of cloudy interstellar medium Yu. ... Figure 1: Averaged spectrum of the cosmic background I f in frequency range 0.25 200 MHz for the Galactic poles. ... First interpretation of the cosmic noise background spectrum at broad band frequency range 0.25 200 MHz with a model of the cloudy interstellar medium ISM is presented here. ... Synthesized background spectra I f for regions of the Galactic poles at the frequency range 0.25 200 MHz is presented in Fig. ...

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Next: AXAF Recipes Up: ROSAT HRI Recipes Previous: Quantum Efficiency Correction (a.k.a. For some observations, a significant amount of data may have been rejected during SASS processing because the background level was higher than the calculated threshold for rejection. ... REJECTED EVENTS . ... The recipe will allow the user to include rejected events in the generation of a new qpoe file and filter on the background level. ... This creates a qpoe file with standard + rejected events. ...

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... Remote observing has long been a part of the Keck Observatory operating plan. ... Remote observing from the Keck HQ now encompasses over 95% of observing runs at the Keck Observatory. Recently, additional efforts have been made to enable remote observing on the Keck Telescopes from the U.S. mainland. ... In this paper, we present a brief summary of the Keck remote observing efforts from the U.S. mainland, with an emphasis on the system at Caltech, which is the most recent to come on-line. ...

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Adjust the redshift z in the applet below using the + and - buttons until the redshifted template of rest wavelengths in RED matches the "observed" spectrum in BLACK. Click the "Show" button to see the actual redshift and compare it to your value. Then click "Restart" to try again with a different randomly generated redshift and spectrum. Your browser does not support Java, or Java is not enabled. ... The numbers on the red template and the spectrum are wavelengths in nanometers . ...

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An Ancient Universe: How Astronomers Know the Vast Scale of Cosmic Time . THE CHANGING UNIVERSE: EVOLUTION HAPPENS! . b) Changes in Stars . One of the great discoveries of modern science is that stars (like people) live only a measurable life-time and then die. Although the lives of the stars are enormously longer than the span of a human life, we can learn about the life story of the stars by studying them at many different stages in their life cycle, from birth to death. ...

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... 19.10.2015 . ... Credit Copyright: Simulating Extreme Spacetimes Collaboration Explanation: What happens when two black holes collide? ... The featured video shows a computer animation of the final stages of such a merger, while highlighting the gravitational lensing effects that would appear on a background starfield . ... Eventually the two black holes coalesce . ... Publications with keywords: black hole - gravitational radiation . Publications with words: black hole - gravitational radiation . ...

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